Level of Organization

Digestive System

A roundworm has a definite digestive system that runs the length of their bodies. It has a mouth, pharynx, intestine and anus. Many are parasites and live off other animals and plants. yurtbiostudents.wikispaces.com

Nervous System

A roundworm has two nerve cords that transmit impulses in the roundworm.

Excretory System

Reproduction

A roundworm reproduces sexually. The female has an ovary, holds eggs in an oviduct and then passes them to the uterus, where they are fertilized. The male has sperm cells are made in the testis and stored in the vas deferens. When it is time to reproduce, the sperm cells pass through the spicule. Over 200,000 eggs can be deposited at once in the soil once they are fertilized. http://health.kernan.org/imagepages/1005.htm